Method of compiling shape data of a spectacle lens, spectacle lens shape data compiling device and spectacle lens

Patent metadata

Field	Value
Publication number	US-9778486-B2
Application number	US-201414322563-A
Country	US
Kind code	B2
Filing date	Jul 2, 2014
Priority date	Mar 12, 2009
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

A spectacle lens capable of obtaining a good vision without feeling of discomfort, even being fitted into a frame having a large front angle, and a method of creating the shape data of the spectacle lens having dioptric power to be fitted into a frame having a lens front angle. The method corrects the shape data of a lens back surface so that the prismatic effect undergone via the lens of initial lens shape by a plurality of rays passing through a rotation center of the eye in a case where a lens front angle is provided is identical or close to the prismatic effect undergone via the lens of initial lens shape by the plurality of rays passing through the rotation center of the eye in a case where no lens front angle is provided.

First claim

The invention claimed is:

1. A method for creating shape data of a spectacle lens to be fitted into a spectacle frame in a state where there is a lens front angle, wherein the spectacle lens has dioptric power, the method comprising:
a step of receiving lens design conditions from an input terminal of a device that creates shape data of a spectacle lens;
a step for creating initial lens shape data defining an initial lens shape of the spectacle lens that is capable of obtaining desired prescription values, the initial lens shape data including lens front surface shape data defining a shape of a lens front surface of the spectacle lens, lens back surface shape data defining a shape of a lens back surface of the spectacle lens, and lens front and back surfaces directions data defining a direction of the lens back surface relative to the lens front surface of the spectacle lens;
a lens back surface shape data correcting step for correcting the lens back surface shape data of the created initial lens shape data by correcting a spherical or a rotationally symmetric aspherical surface shape to a bilaterally asymmetrical aspherical surface shape and by correcting a toroidal or an atoroidal surface shape to a bilaterally asymmetrical atoroidal surface shape; and
a step of outputting the corrected lens back surface shape data via an output terminal of the device,
wherein the lens back surface shape data correcting step comprises:
a prismatic effect correcting step for correcting the lens back surface shape data of the initial lens shape data, using a hardware processor of the device, so that a first prismatic effect of the spectacle lens of the initial lens shape on a plurality of rays passing through a rotation center of an eye assumed in optical design of the spectacle lens of the initial lens shape when assuming that the spectacle lens of the initial lens shape has been fitted into the spectacle frame in the state where there is a lens front angle, is identical or close to a second prismatic effect of the spectacle lens of the initial lens shape on the plurality of rays passing through the rotation center of the eye assumed in optical design of the spectacle lens of the initial lens shape when assuming that the spectacle lens of the initial lens shape has been fitted into the spectacle frame in a state where there is no lens front angle, wherein the plurality of rays include a ray in the front view direction, and

wherein the prismatic effect correcting step comprises:
a direction correcting step for correcting the lens front and back surfaces directions data of the initial lens shape data so that the first prismatic effect of the spectacle lens of the initial lens shape on the ray in the front view direction of the plurality of rays passing through the rotation center of the eye assumed in optical design of the spectacle lens of the initial lens shape when assuming that the spectacle lens of the initial lens shape has been fitted into the spectacle frame in a state where there is a lens front angle, is identical to the second prismatic effect of the spectacle lens of the initial lens shape on the ray in the front view direction of the plurality of rays passing through the rotation center of the eye assumed in optical design of the spectacle lens of the initial lens shape when assuming that the spectacle lens of the initial lens shape has been fitted into the spectacle frame in a state where there is no lens front angle; and
a shape correcting step for correcting the lens back surface data obtained after performing the direction correcting step so that a third prismatic effect of the spectacle lens of a lens shape according to the initial lens shape data obtained after the direction correcting step on one or more rays of the plurality of rays passing through the rotation center of the eye assumed in optical design of the spectacle lens of the initial lens shape when assuming that the spectacle lens of the initial lens shape has been fitted into the spectacle frame in a state where there is a lens front angle, is identical or close to the second prismatic effect of the spectacle lens of the initial lens shape on the one or more rays of the plurality of rays passing through the rotation center of the eye assumed in optical design of the spectacle lens of the initial lens shape when assuming that the spectacle lens of the initial lens shape has been fitted into the spectacle frame in a state where there is no lens front angle, wherein the one or more rays exclude the ray in the front view direction.

2. A method for creating shape data of a spectacle lens to be fitted into a spectacle frame in a state where there is a lens front angle, wherein the spectacle lens has dioptric power, the method comprising:
a step of receiving lens design conditions from an input terminal of a device that creates shape data of a spectacle lens;
a step for creating initial lens shape data defining an initial lens shape of the spectacle lens that is capable of obtaining desired prescription values, the initial lens shape data including lens front surface shape data defining a shape of a lens front surface of the spectacle lens, lens back surface shape data defining a shape of a lens back surface of the spectacle lens, and lens front and back surfaces directions data defining a direction of the lens back surface relative to the lens front surface of the spectacle lens;
a lens back surface shape data correcting step for correcting the lens back surface shape data of the created initial lens shape data by correcting a spherical or a rotationally symmetric aspherical surface shape to a bilaterally asymmetrical aspherical surface shape and by correcting a toroidal or an atoroidal surface shape to a bilaterally asymmetrical atoroidal surface shape; and
a step of outputting the corrected lens back surface shape data via an output terminal of the device,
wherein the lens back surface shape data correcting step comprises:
a prismatic effect correcting step for correcting the lens back surface shape data of the initial lens shape data, using a hardware processor of the device, so that a first prismatic effect of the spectacle lens of the initial lens shape on a plurality of rays passing through an entrance pupil center of an eye when viewing objects in front vision assumed in optical design of the spectacle lens of the initial lens shape when assuming that the spectacle lens of the initial lens shape has been fitted into the spectacle frame in a state where there is a lens front angle, is identical or close to a second prismatic effect of the spectacle lens of the initial lens shape on the plurality of rays passing through the entrance pupil center of the eye when viewing objects in front vision assumed in optical design of the spectacle lens of the initial lens shape when assuming that the spectacle lens of the initial lens shape has been fitted into the spectacle frame in a state where there is no lens front angle, wherein the plurality of rays include a ray in the front view direction, and

wherein the prismatic effect correcting step comprises:
a direction correcting step for correcting the lens front and back surfaces directions data of the initial lens shape data so that the first prismatic effect of the spectacle lens of the initial lens shape on the ray in the front view direction of the plurality of rays passing through the entrance pupil center of the eye when viewing objects in front vision assumed in optical design of the spectacle lens of the initial lens shape when assuming that the spectacle lens of the initial lens shape has been fitted into the spectacle frame in a state where there is a lens front angle, is identical to the second prismatic effect of the spectacle lens of the initial lens shape on the ray in the front view direction of the plurality of rays passing through the entrance pupil center of the

Assignees

• Hoya Corp

Inventors

• Kozu Kazuma
• Hatanaka Takashi

Classifications

• G06F30/00

  Computer-aided design [CAD] · CPC title

• G02C7/061

  Spectacle lenses with progressively varying focal power · CPC title

• G02C7/024 Primary

  Methods of designing ophthalmic lenses · CPC title

• G02C7/027 Primary

  considering wearer's parameters · CPC title

• G02C7/02

  Lenses; Lens systems {; Methods of designing lenses} · CPC title